willful

/ˈwɪlfəl/
adjective
  1. Done on purpose; deliberate and intentional.
    • The driver's willful disregard for the traffic laws caused the accident.
    • She made a willful decision to quit her job and travel the world.
    • The court found him guilty of willful destruction of property.
  2. Having a strong and stubborn determination to do what one wants, even when others disagree.
    • He was a willful child who always insisted on having his own way.
    • The willful toddler refused to eat anything but crackers.
    • Her willful personality made her a difficult team member.